Improvement in clamps



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HHH

HINHUHH FIGLI.

N. PETERS. PHOTOALtTHOGRAMER, WASHINGTON. D, C.

`ties with projecting jaws or arms, andat back with a j spiral cani,pivoted upon one bar and engaging with a i i rack on the other, ashereinafter described.

v General Description with Reference to the Drawing. Figure 1 is aperspective view of a clamp embody- `'cam detached. i i

4 i j clamp.`

`toibe clamped.

slideiu a groove oi' channel, F, formed by two flanges,

j other parts, and are connected by a bridge, H, having sidewitlia-spiral thread, L, that gearswith a corresponding rack, M, on the frontside of the shank D.

@me and.

marasma JoIInJgLEBEAU, or

CINCINNATI, oHIo.

L'etters Patent No. 104,606, dated .Tune 21, 1870.

mrnovnmnm: m cnet/Irs.

The Schedule referred to in these Letters Ifatexn:w and making part ofthe same I, JOIIN J. LEBEU, of Cincinnati, Hamilton county, Ohio, haveinvented a new and useful Clamp, oi' which the following isaspecification.

Nature and Objects of the Invention. v The subject of myinvention is aclamp for molders, cabinet-makers, and others. Y 4 It consists,essentially, ot' a pair of bars, sliding one upon or within tha-other,provided at their extremiing'my invention. j

Figure 2 is` a rear perspective \"iew ofthe spiral Figure 3 is atransvere section at the line a: a'.

Figure 4 is `a longitudinal section of a portion of' my Figure ral cam.

is `a -rear view of a inodiiiea'tion of my spi- A A' represent portionsof a dusk or 4other article B` and C are the jaws,projectin grectangular-ly from s 'hanks D and E, 'ot' which the shank D is adaptedto Gr G', on the front side ofthe shank E.

The anges G G' are at their inner ends somewhat more elevated from thefront of the shank than at a circular boss, l, that enters acorresponding eye or orifice, J, at the centre of adisk, K, armed on its`rear The cam-disk K L is centered and held in place on the boss I bymeans of a screw-bolt, N, and nut O, a washer; P, being interposedbetween the nut'O and oi' said disk about the boss I as a center,without loosening or disturbing the'nut.

' The cam-disk K L is turned either forward or backward at will, bymeansof itshandle Q.

The bridge'H, together with its appendages I N O P, is set at sufficientObliquity with' the shank E to cause its thread L to enter or engagewith the rack M on one sideonly. i

It will be seen that no part of this clamp projects beyond the jaws, andthattlie means employed for extending or contracting it, or such as, bytheir Yfriction, to hold the jaws to any specific adjustment with'- outany speelde or special contriva'nce for that pur-` pose. 4.

Instead of making the cam of a single continuous thread, as representedin figs. 1, 2, 3, and 4, it maybe in g. 5, more threads may and in somecases, if preferred, two, three, or

thread engaging before its predecessor has left.

That'side of the cam from which the thread L pro-'- jects maybe slightlyconed or crowned, instead of dat, as in the present illustration.

4 Ola/im.

- I claini as my invention-` '.Lhe relative arrangement of the jaws Band C, pro v jecting from the extremities of their respective shanks Dand E, in combination with the ca1n-disks K L, pivoted to a bridge atthe back of one shank, and engag ing with a rack, M, at back of theother, when consti-noted substantial] y as and for the purposesspecified. In testimony of which invention I hereunto setmy liand.

J. J. LEBEAU.

fitncsses Guo. H. KNIGHT, JAMES H. LAYMAN.

be employed, and the said threads lshould be arranged in a manner thatwill insure one

